From: Richard Henderson <richard.henderson@linaro.org>
To: Leandro Lupori <leandro.lupori@eldorado.org.br>,
qemu-devel@nongnu.org, qemu-ppc@nongnu.org
Cc: npiggin@gmail.com
Subject: Re: [PATCH v3] tcg/ppc: Optimize 26-bit jumps
Date: Tue, 4 Oct 2022 07:11:56 -0700 [thread overview]
Message-ID: <afc00ecd-9750-e369-dda0-3c51fefb3baf@linaro.org> (raw)
In-Reply-To: <2ae7b41c-0a1a-dc2a-d7cf-bb14096f524f@eldorado.org.br>
On 10/3/22 11:32, Leandro Lupori wrote:
> On 9/19/22 14:56, Leandro Lupori wrote:
>> PowerPC64 processors handle direct branches better than indirect
>> ones, resulting in less stalled cycles and branch misses.
>>
>> However, PPC's tb_target_set_jmp_target() was only using direct
>> branches for 16-bit jumps, while PowerPC64's unconditional branch
>> instructions are able to handle displacements of up to 26 bits.
>> To take advantage of this, now jumps whose displacements fit in
>> between 17 and 26 bits are also converted to direct branches.
>>
>> Signed-off-by: Leandro Lupori <leandro.lupori@eldorado.org.br>
>> ---
>> v3:
>> - make goto tb code 16-byte aligned
>> - code cleanup
>>
>
> Ping?
>
> Does v3 look good now?
It does, thanks. I will queue it for tcg-next.
r~
prev parent reply other threads:[~2022-10-04 15:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-19 17:56 [PATCH v3] tcg/ppc: Optimize 26-bit jumps Leandro Lupori
2022-10-03 18:32 ` Leandro Lupori
2022-10-04 14:11 ` Richard Henderson [this message]
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